The number of individuals experiencing sleep loss has exponentially risen over the past
decades. Extrapolation of laboratory findings to the real world suggests that females are …

Sleep serves important biological functions, and influences health and longevity through
endocrine and metabolic related systems. Sleep debt, circadian misalignment and sleep …

Semen quality represents a compelling factor for fertility, and delineating the normal values
has proven difficult. In the last four decades, several authors have reported a noticeable …

Steroid hormone levels are closely related to the endogenous circadian rhythm induced by
sleep–wake and dark–light cycles. Shift work that disrupts the circadian rhythm may …

Background Semen quality significantly influences conception, and its preservation is crucial
for couples seeking pregnancy. We investigated dietary and lifestyle risk factors impacting …

Sleep has been related to a variety of health outcomes. However, no association between
sleep and asthenozoospermia has been reported. The aim of this study is to first investigate …

Introduction Many factors may be hidden behind the global fertility decline observed in
Western countries. Alongside the progressively increased age of infertile couples …

Sleep problems among shift workers have emerged as a public health concern in recent
years. However, few validation studies of self-reported sleep quality questionnaires were …

Context Night-shift work causes circadian misalignment, predicts the development of
metabolic diseases, and complicates the interpretation of hormone measurements …

For decades, researchers have been asking if sperm counts are decreasing worldwide, and
if so, whether this presages a global decline in male fertility. Most recently, a large …